- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄358885 > LMV721M5X (NATIONAL SEMICONDUCTOR CORP) 10MHz, Low Noise, Low Voltage, and Low Power Operational Amplifier PDF資料下載
參數(shù)資料
| 型號： | LMV721M5X |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 運動控制電子 |
| 英文描述： | 10MHz, Low Noise, Low Voltage, and Low Power Operational Amplifier |
| 中文描述： | OP-AMP, 3000 uV OFFSET-MAX, 10 MHz BAND WIDTH, PDSO5 |
| 封裝： | SOT-23, 5 PIN |
| 文件頁數(shù)： | 10/15頁 |
| 文件大?。?/td> | 459K |
| 代理商： | LMV721M5X |
Application Notes
(Continued)
4.3 Single-Supply Inverting Amplifier
There may be cases where the input signal going into the
amplifier is negative. Because the amplifier is operating in
single supply voltage, a voltage divider using R
and R
is
implemented to bias the amplifier so the input signal is within
the input common-common voltage range of the amplifier.
The capacitor C
is placed between the inverting input and
resistor R
1
to block the DC signal going into the AC signal
source, V
. The values of R
1
and C
1
affect the cutoff fre-
quency, fc =
1
2
π
R
1
C
1
.
As a result, the output signal is centered around mid-supply
(if the voltage divider provides V
+
/2 at the non-inverting in-
put). The output can swing to both rails, maximizing the
signal-to-noise ratio in a low voltage system.
4.4 Active Filter
4.4.1 Simple Low-Pass Active Filter
The simple low-pass filter is shown in Figure 9 Its low-pass
frequency gain (
ω →
o) is defined by R
/R
. This allows
low-frequency gains other than unity to be obtained. The fil-
ter has a 20dB/decade roll-off after its corner frequency fc.
R
should be chosen equal to the parallel combination of R
1
and R
to minimize error due to bais current. The frequency
response of the filter is shown in Figure 10
Note that the single-op-amp active filters are used in to the
applications that require low quality factor, Q(
≤
10), low fre-
quency (
≤
5KHz), and low gain (
≤
10), or a small value for the
product of gain times Q(
≤
100). The op amp should have an
open loop voltage gain at the highest frequency of interest at
least 50 times larger than the gain of the filter at this fre-
quency. In addition, the selected op amp should have a slew
rate that meets the following requirement:
Slew Rate
≥
0.5 x (
ω
H
V
OPP
) X 10
6
V/μsec
Where
ω
is the highest frequency of interest, and V
OPP
is
the output peak-to-peak voltage.
DS100922-22
FIGURE 7. Two-op-amp Instrumentation Amplifier
DS100922-23
FIGURE 8. Single-Supply Inverting Amplifier
DS100922-24
FIGURE 9. Simple Low-Pass Active Filter
DS100922-25
FIGURE 10. Frequency Response of Simple Low-pass
Active Filter in
Figure 9
www.national.com
10
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LMV721M5 | 10MHz, Low Noise, Low Voltage, and Low Power Operational Amplifier |
| LMV7239 | 45ns, Ultra Low Power, Low Voltage, Rail-to-Rail Input Comparator with Open-Drain/Push-Pull Output |
| LMV7239M5 | DIODE ZENER SINGLE 200mW 11Vz 20mA-Izt 0.05 2uA-Ir 8.4 SOT-323 3K/REEL |
| LMV7239M5X | 45ns, Ultra Low Power, Low Voltage, Rail-to-Rail Input Comparator with Open-Drain/Push-Pull Output |
| LMV7239M7 | DIODE ZENER SINGLE 350mW 12Vz 20mA-Izt 0.05 1uA-Ir 9.1 SOT-23 3K/REEL |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LMV721M5X/NOPB | 功能描述:運算放大器 - 運放 RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| LMV721M7 | 功能描述:運算放大器 - 運放 RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| LMV721M7 | 制造商:Texas Instruments 功能描述:OP AMP ULTRA LOW NOISE POWERWISE |
| LMV721M7/NOPB | 功能描述:運算放大器 - 運放 Ultra Low Noise Sgl Op Amp RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| LMV721M7X | 功能描述:運算放大器 - 運放 RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。